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Influence of pH, Heat and Enzymatic Treatments on the Activity of Antibacterial Substance in MRS and Milk Media Produced by Lactobacillus fermentum F6

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Agricultural Sciences in China 2010年第6期9卷 911-920页

作者： ZHANG Yong liu Yong bao Yan ZHANG He-ping Key Laboratory of Dairy Biotechnology and Engineering Ministry of Education/Department of Food Science and Engineering InnerMongolia Agricultural University Hohhot 010018 P.R. China

This study aimed to investigate the influence of pH,heat and enzymatic treatments on the activity of antibacterial substance in MRS,skim soy milk and bovine milk media fermented by a potential probiotic Lactobacillus fermentum *** antibacterial activity of the culture supernatant of *** F6 was tested against a wide range of Gram-positive and Gram-negative pathogenic bacteria including Staphylococcus aureus,Escherichia coli,Listeria monocytogenes,Salmonella typhimurium,and Shigella *** antibacterial activities were detected in MRS and milk but not in soy *** presumed that three kinds of probable components including organic acids,heat-stable and heat-labile proteinaceous compounds were involved in antibacterial activity of fermented MRS and *** influence of acids on antibacterial activity was pH-dependent and this effect multiplied with thermal treatments seemed *** analyses showed various significant differences of antibacterial activity among five pathogens were observed in pH and heat *** untreated fermented milk showed higher inhibitory activity to Gram-positive pathogenic bacteria than Gram-negative bacteria （P 〈 0.05）,indicating antibacterial substances of fermented milk are greatly different from fermented *** accurate stimulated gastrointestinal transit showed antibacterial substances would have no influence on intestinal *** range of antibacterial substances from pH 2.0 to 6.0 can be potentially used as food biopreservatives and alternative therapeutics.

关键词： Lactobacillusfermentum F6 antibacterial activity pH thermal treatments enzymatic effect

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The roles of graphene in advanced Li-ion hybrid supercapacitors

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Journal of Energy Chemistry 2018年第1期27卷 43-56页

作者： Junwei Lang Xu Zhang bao liu RutaoWang Jiangtao Chen Xingbin Yan Laboratory of Clean Energy Chemistry and Materials State Key Laboratory of Solid LubricationLanzhou Institute of Chemical PbysicsLanzhou 730000GansuChina Qingdao Center of Resource Chemistry&New Materials Qingdao 266071SbandongChina

Lithium-ion hybrid supercapacitors （LIHSs）, also called Li-ion capacitors, are electrochemical energy stor- age devices that combining the advantages of high power density of supercapacitor and high energy density of Li-ion battery. However, high power density and long cycle life are still challenges for the cul~ rent LIHSs due to the imbalance of charge-storage capacity and electrode kinetics between capacitor-type cathode and battery-type anode. Therefore, great efforts have been made on designing novel cathode materials with high storage capacity and anode material with enhanced kinetic behavior for LIHSs. With unique two-dimensional form and numerous appealing properties, for the past several years, the rational designed graphene and its composites materials exhibit greatly improved electrochemical performance as cathode or anode for LIHSs. Here, we summarized and discussed the latest advances of the state- of-art graphene-based materials for LIHSs applications. The major roles of graphene are highlighted as （1） a superior active material, （2） ultrathin 2D flexible support to remedy the sluggish reaction of the metal compound anode, and （3） good 2D building blocks for constructing macroscopic 3D pOFOUS car- bonjgraphene hybrids. In addition, some high performance aqueous LIHSs using graphene as electrode were also summarized. Finally, the perspectives and challenges are also proposed for further develop- ment of more advanced graphene-based LIHSs.

关键词： Graphene Li-ion hybrid supercapacitors Supercapacitor Lithium ion batteries Carbon materials Metal oxide Naoocomposites

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Influences of meridional flowpath on the performance of swept blade in an axial compressor stage

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航空动力学报 2015年第8期30卷 1875-1887页

作者： YU Xian-jun XU Peng-fei ZHANG Yi-fei liu bao-jie School of Energy and Power Engineering Beiiing University of Aeronautics and Astronautics Beijing 100191 China National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics School of Energy and Power EngineeringBeijing University of Aeronautics and Astronautics Beijing 100191 China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100191 China

A series of numerical simulations were conducted in both a 1.5stage axial compressor model and a simplified planar cascade *** cases with different blade sweep schemes in the cascade model were simulated with free-slip endwalls to minimize the influence of endwall 3-D(three-dimensional)*** results obtained in the cascade model were discussed at first for getting a clear insight into the effects of blade sweep without other *** then the simulation results of the 1.5stage compressor model were discussed *** discussions focused on the influences of different meridional flowpath designs,*** mid radius(CMR)design,constant outer radius(COR)design and constant inner radius(CIR)design,on the performance of the swept *** results showed that the most critical effect produced by blade sweep was attributed to the redistribution of local mass-flow-rate in blade spanwise *** change of meridional flowpath did not change the mass-flow-rate redistribution ***,the trends for local mass-flow-rate redistribution in compressor stage model showed some discrepancies compared with the results shown in the planar cascade model.

关键词：航空航空动力学航空发动机发动原理

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Type-B response regulator OsRR22 forms a transcriptional activation complex with OsSLR1 to modulate OsHKT2;1 expression in rice

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Science China(Life Sciences) 2023年第12期66卷 2922-2934页

作者： Yutong liu Xiaoyuan Peng Ao Ma Wenxin liu bao liu Dae-Jin Yun Zheng-Yi Xu Key Laboratory of Molecular Epigenetics of the Ministry of Education(MOE) Northeast Normal UniversityChangchun 130024China Department of Biomedical Science and Engineering Konkuk UniversitySeoul 05029Republic of Korea

Soil salinity severely limits crop yields and *** have evolved several strategies to mitigate the adverse effects of salinity,including redistribution and compartmentalization of toxic ions using ion-specific ***,the mechanisms underlying the regulation of these ion transporters have not been fully ***-of-function mutants of OsHKT2;1,which is involved in sodium uptake,exhibit strong salt stress-resistant *** this study,OsHKT2;1 was identified as a transcriptional target of the type-B response regulator ***-of-function osrr22 mutants showed resilience to salt stress,and OsRR22-overexpression plants were sensitive to salt ***22 was found to activate the expression of OsHKT2;1 by directly binding to the promoter region of OsHKT2;1 via a consensus cis-element of type-B response ***,rice DELLA protein OsSLR1 directly interacted with OsRR22 and functioned as a transcriptional *** study has uncovered a novel transcriptional regulatory mechanism by which a type-B response regulator controls sodium transport under salinity stress.

关键词： Oryza sativa type-B response regulator transcriptional regulation sodium transport

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Strong coupling without touching

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National Science Review 2014年第4期1卷 472-473页

作者： Ren-bao liu Quan Li Department of Physics and Centre for Quantum Coherence The Chinese University of Hong Kong

If an excited atom is put in between highrelectance mirrors,the light emited by the atom can be bounced back and be re-absorbed and be re-emited,again and again until the light leaks out of the mirrors or is re-emited into a wrong *** coherent oscillation between atom and light,called vacuum Rabi oscillation,results from interference between

关键词： high Strong coupling without touching than

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Planning issues on linac-based stereotactic radiotherapy

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World Journal of Clinical Cases 2022年第35期10卷 12822-12836页

作者： Yang-Yang Huang Jun Yang Yi-bao liu School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013Jiangxi ProvinceChina Department of Radiotherapy The Second Affiliated Hospital of Zhengzhou UniversityZhengzhou 450014Henan ProvinceChina Department of Radiotherapy The Third Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052Henan ProvinceChina

This work aims to summarize and evaluate the current planning progress based on the linear accelerator in stereotactic radiotherapy(SRT).The specific techniques include 3-dimensional conformal radiotherapy,dynamic conformal arc therapy,intensity-modulated radiotherapy,and volumetric-modulated arc therapy(VMAT).They are all designed to deliver higher doses to the target volume while reducing damage to normal tissues;among them,VMAT shows better prospects for *** paper reviews and summarizes several issues on the planning of SRT to provide a reference for clinical application.

关键词： Stereotactic radiotherapy Treatment technology Energy Isocenters Coplanar/noncoplanar fields Calculation algorithm Multileaf collimator leaf width Flattening filter free mode Small field dosimetry Grid size

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New Polypeptides from Chinese Mistletoe, Viscum coloratum (Kom.) Nakai

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Chinese Chemical Letters 2006年第1期17卷 41-44页

作者： Shi Lei liu Xiu bao DU Jing Lin KONG Research Institute of Chemical Defense Beijing 102205

Three viscotoxins have been isolated from Chinese mistletoe, Viscum coloratura （Kom.） Nakai. The primary structures were determined unambiguously by the combination of Edman degradation, endoproteinase Elu-c digestion, and Q-TOF mass spectrometry. One was identified as viscotoxin C1, which was for the first time isolated from Chinese mistletoe. The other two were new polypeptides, named as viscotoxin B5 and viscotoxin B8. Pharmacological studies showed that the polypeptides exhibit distinct cytotoxicity to human cancer cells.

关键词： Viscum coloratura mistletoe isolation primary structure viscotoxin.

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Radar automatic target recognition based on feature extraction for complex HRRP

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Science in China(Series F) 2008年第8期51卷 1138-1153页

作者： DU Lan liu HongWei bao Zheng ZHANG JunYing National Laboratory of Radar Signal Processing Xidian University Xi'an 710071 China

Radar high-resolution range profile （HRRP） has received intensive attention from the radar automatic target recognition （RATR） community. Usually, since the initial phase of a complex HRRP is strongly sensitive to target position variation, which is referred to as the initial phase sensitivity in this paper, only the amplitude information in the complex HRRP, called the real HRRP in this paper, is used for RATR, whereas the phase information is discarded. However, the remaining phase information except for initial phases in the complex HRRP also contains valuable target discriminant information. This paper proposes a novel feature extraction method for the complex HRRP. The extracted complex feature vector, referred to as the complex feature vector with difference phases, contains the difference phase information between range cells but no initial phase information in the complex HRRR According to the scattering center model, the physical mechanism of the proposed complex feature vector is similar to that of the real HRRP, except for reserving some phase information independent of the initial phase in the complex HRRP. The recognition algorithms, frame-template establishment methods and preprocessing methods used in the real HRRP-based RATR can also be applied to the proposed complex feature vector-based RATR. Moreover, the components in the complex feature vector with difference phases approximate to follow Gaussian distribution, which make it simple to perform the statistical recognition by such complex feature vector. The recognition experiments based on measured data show that the proposed complex feature vector can obtain better recognition performance than the real HRRP if only the cell interval parameters are properly selected.

关键词： complex high-resolution range profile (HRRP) radar automatic target recognition (RATR) feature extraction minimum Euclidean distance classifier adaptive Gaussian classifier (AGC)

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Laser-induced cleaning for modulating hydrophilic/hydrophobic properties of Ti-6Al-4V alloy surface microstructure

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Tungsten 2024年第4期6卷 669-674页

作者： Zhi-Hao Chen bao liu Yan-Hu Zhang Institute of Advanced Manufacturing and Modern Equipment Technology Jiangsu UniversityZhenjiang212013China Automotive Engineering Research Institute Jiangsu UniversityZhenjiang212013China Department of Mechanical Engineering City University of Hong KongHong Kong999077China

Surface treatment of metals is a primary method to prevent equipment *** significant efforts and notable advancements,many existing technologies incur high costs and demanding technical requirements,particularly in th... 详细信息

关键词： microstructure alloy cemented

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Power optimization for maximum channel capacity in MIMO relay system

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The Journal of China Universities of Posts and Telecommunications 2007年第3期14卷 10-15页

作者： WANG Ying SHEN Xiao-dong WU Tong liu bao-ling Key Laboratory of Ubiquitous Wireless Communication Ministry ofEducation Beijing University of Posts and TelecommunicationsBeijing 100876 China

Introducing multiple-input multiple-output（MIMO） relay channel could offer significant capacity gain. And it is of great importance to develop effective power allocation strategies to achieve power efficiency and improve channel capacity in amplify-and-forward relay system. This article investigates a two-hop MIMO relay system with multiple antennas in relay node （RN） and receiver （RX）. Maximizing capacity with antenna selection（MCAS） and maximizing capacity with eigen-decomposition （MCED） schemes are proposed to efficiently allocate power among antennas in RN under first and second hop limited scenarios. The analysis and simulation results show that both MCED and MCAS can improve the channel capacity compared with uniform power allocation （UPA） scheme in most of the studied areas. The MCAS bears comparison with MCED with an acceptable capacity loss, but lowers the complexity by saving channel state information （CSI） feedback to the transmitter （TX）. Moreover, when the RN is close to RX, the performance of UPA is also close to the upper bound as the performance of first hop is limited.

关键词： MIMO-relay MCAS MCED UPA maximum channel capacity

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